<HTML><HEAD><TITLE>ord_symdiff(+Set1, +Set2, -Difference)</TITLE>
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<H1>ord_symdiff(+Set1, +Set2, -Difference)</H1>
Computes the symmetric difference of Set1 and Set2
<DL>
<DT><EM>Set1</EM></DT>
<DD>A set
</DD>
<DT><EM>Set2</EM></DT>
<DD>A set
</DD>
<DT><EM>Difference</EM></DT>
<DD>A set or variable
</DD>
</DL>
<H2>Description</H2>
	Succeeds when Difference is the symmetric difference of Set1 and Set2.
	These are the elements that occur either only in Set1 or only in Set2,
	but not both.
    
<H3>Modes and Determinism</H3><UL>
<LI>ord_symdiff(+, +, -) is det
</UL>
<H2>See Also</H2>
<A HREF="../../lib/ordset/ord_subtract-3.html">ord_subtract / 3</A>
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